When unadapted to ketosis the body can excrete up to 100 kcal of ketones: As a side note, urinary and breath excretion of acetone is negligible in terms of caloric loss, amounting to a maximum of 100 calories per day (2).
Mate selection may also be a factor associated with bilateral symmetry in humans. A December 2005 article by health and environmental reporting expert, Ker Than, reports on an experiment that indicated women are more attracted to men that have more symmetrical features.
First, we should define symmetry. Symmetry is the arrangement of body parts so they can be divided equally along an imaginary line or axis. In marine life, the two main types of symmetry are bilateral symmetry and radial symmetry, although there are some organisms that exhibit biradial symmetry (e.g., ctenophores) or asymmetry (e.g., sponges).